You know, I suggested an battery under carriage, but thinner then the current one, so the visual ratios look pleasing. I am going have another crack at it.
What about a pro cage grip, with extra batteries, mount points, hot swappable ssd's etc, as sleek and sexy as (and a micro version). Sort of, s that a camera you pulled from your pocket, or a Porsche (well not literally, it be hard to make that to still fit many peoples pockets). People like the look/form, and the next pocket can look like a slimmer version of the grip (and please with lite mount points to stick microphones, batteries, LCDs, lights, storage, and optional under mount section for a lens carrier (the camera and lens attaches to it and it carries the weight of both, and it mounts on a tripod. Maybe with a large battery mount point on the back of the lens mount, and optional shoulder shoulder mount with an rear battery mount over the back to balance it off to bring the camera forwards for viewing. So, the battery goes on the lens mount of the shoulder extends the connection to it's rear. The shoulder mount then connects to behind the camera, or under it. So both have two mounting points)). This would give you pretty dandy configurations in a, "I don't care if its not an Alexa" configuration. BM should have aimed one if the small cameras to be ideal for behind the scenes photography and videos. Which would get it noticed and people used to BM on set. So that's marketing.
Mr Grant, please?